package com.ming.aspect;

import com.ming.annotation.AutoFill;
import com.ming.constant.AutoFillConstant;
import com.ming.context.BaseContext;
import com.ming.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;


@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     *
     */
    @Pointcut("execution(* com.ming.mapper.*.*(..)) && @annotation(com.ming.annotation.AutoFill)")
    public void autoFillPointCut() {

    }

    /**
     * 前置通知
     *
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行数据填充");
        //获取到当前被拦裁的方法上的数据库操作类型
        MethodSignature signature =  (MethodSignature) joinPoint.getSignature(); // 方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); // 获得方法上的注解对象
        OperationType type = autoFill.value(); // 获得数据库操作类型

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];

        //准备赋値的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();


        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if (type == OperationType.INSERT) {
            // 为4个属性赋值
            try {
                Method setCreateTime =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);

                Method setUpdateTime =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);

                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);

            } catch (Exception e) {
                e.printStackTrace();
            }

        } else if (type == OperationType.UPDATE) {
            // 为2个属性赋值
            try {
                Method setUpdateTime =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }


    }
}
